Combining Adaptive Coding and Modulation With Hierarchical Modulation in Satcom Systems

Meric, Hugo; Lacan, Jérôme; Arnal, Fabrice; Lesthievent, Guy; Boucheret, Marie‐Laure

doi:10.1109/tbc.2013.2268694

Cited by 35 publications

(63 citation statements)

References 17 publications

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“…We provide all the parameters used in the simulations in Section IV. A detailed description for designing the hierarchical 16-APSK can be found in [9], while the hierarchical QPSK and 32-APSK are treated in [10].…”

Section: Modulationmentioning

confidence: 99%

Optimising DVB-S2 spectral efficiency with hierarchical modulation for broadband applications

Meric¹

2015

Int. J. Satell. Commun. Network.

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We study the design of a digital video broadcasting -satellite -second generation broadband system in order to maximise spectral efficiency. This task is usually challenging because of channel variability. The solution adopted in modern satellite communications systems relies mainly on a time-sharing strategy. Recently, we demonstrated the advantage of combining time sharing with hierarchical modulation to increase the transmission rate of such systems. However, the optimal spectral efficiency remained an open question. In this paper, we show that the optimal transmission rate is the solution of a linear programming problem. We study the performance of the optimal scheme for interactive satellite services in the context of a digital video broadcasting -satellite -second generation system. et al. optimised APSK modulations with respect to several criteria (minimum Euclidean distance and mutual information) for nonlinear channel [9]. This work serves as a guideline to the DVB-S2 standard. However, they did not address the design of hierarchical modulation. As already mentioned, hierarchical modulations merge several streams in a same symbol. The principle is to share the available energy between each stream. In this paper, we consider two layers hierarchical modulations where two streams are merged in each constellation symbol as depicted in Figure 1. The extension to n-layers hierarchical modulation will be discussed in Section 5.As each stream usually does not use the same amount of energy, hierarchical modulations often rely on non-uniform constellations, where the symbols are not uniformly distributed in the space. The use Digital video broadcasting -satellite -second generation.

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Section: Modulationmentioning

confidence: 99%

Optimising DVB-S2 spectral efficiency with hierarchical modulation for broadband applications

Meric¹

2015

Int. J. Satell. Commun. Network.

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“…Recently, there have been several proposals which adopt the concept of NOMA [2], [3]; however, in almost every of these proposals, successive interference cancellation (SIC) is employed at the receivers (at least some of the receivers) in some form or other. This is typically not an issue for uplink NOMA as the base station can afford large computational complexity; however, it would be an issue for downlink NOMA with cheap devices and for applications with very sensitive latency constraints.…”

Section: Introductionmentioning

confidence: 99%

On Gray Labeling for Downlink Non-Orthogonal Multiple Access Without SIC

et al. 2016

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The impact of labeling multilevel coding scheme with a pulse amplitude modulation (PAM) constellation in the downlink non-orthogonal multiple access (NOMA) system is studied. Particular interest is paid to the case where the strong receiver does not perform successive interference cancellation (SIC) before decoding its desired message. With judiciously chosen parameters, this scheme with non-Gray labeling is shown to achieve the capacity region to within a constant gap in [IEEE Trans. Commun., vol. 64, no. 4, pp. 1624-1635]. In this letter, analytic and extensive simulation results are provided to show that for this scheme, among Gray labeling, natural labeling, and non-Gray labeling, Gray labeling provides the best performance in terms of symbol error rates, block error rates, and ǫ-feasible rates. Simulation results also indicate that using Gray labeling, the performance gap between receivers with and without SIC can be further bridged, which suggests the possibility of avoiding SIC in NOMA.

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“…Circular type constellations such as amplitude phase-shift keying (APSK) that consist of multiple PSK rings with different radii [4], [5] are known to have low PAPR and thus have been adopted for satellite communications such as digital video broadcasting-satellite-second generation (DVB-S2) [6]. Furthermore, several constellation optimization approaches have been performed for broadcasting systems [7], [8], and a satellite broadcasting system with hierarchical 16-APSK and time sharing is proposed to increase the throughput in [9]. So far, APSK has been mostly studied in combination with BICM and capacity approaching channel coding such as turbo codes and low-density parity-check (LDPC) codes [4], [5].…”

Section: Introductionmentioning

confidence: 99%

Multilevel Coded Modulation With Reduced Latency Decoding Based on Novel Set Partitioning for APSK

Yoda

Ochiai

2015

IEEE Trans. on Broadcast.

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We address the use of a multilevel coding (MLC) to the amplitude phase-shift keying (APSK) modulations that consist of multiple PSK rings of different radii with a distinct number of constellation points. Such modulations have been adopted in the satellite broadcasting standards since they have a significant advantage over commonly used square-type quadrature amplitude modulations; their signals exhibit lower peak-to-average power ratio and thus enhance the power amplifier efficiency at the transmitter. A common low-complexity approach for decoding of MLC is the multi-stage decoding (MSD). However, MSD in general leads to severe latency at the decoder since the binary decisions on the higher levels should wait for those of the lower levels. Furthermore, this latency issue is even more salient for APSK signaling due to its circular nature of constellations that does not allow its decomposition into in-phase and quadrature components (i.e., I-Q decomposition). Therefore, in this paper we introduce a new MLC design for APSK that enables the decoder to reduce its latency without any increase in terms of complexity. The proposed approach consists of a novel labeling with an unconventional set partitioning that allows the detector to make use of I-Q decomposition. Specifically, the proposed set partitioning results in a quadrature-PSK constellation at the penultimate level, which can be decomposed into a pair of separately decodable binary-PSK constellations at the final level. The resulting decoder consists of a combination of MSD and parallel independent decoding that can be implemented with lower latency. The simulation results together with the theoretical analyses demonstrate that the reduction of not only the decoding latency but also the complexity in bit metric calculation can be achieved without noticeable degradation in terms of error performance compared to the conventional set partitioning approach.Index Terms-Amplitude phase-shift keying (APSK), digital video broadcasting-satellite-second generation (DVB-S2), in-phase and quadrature (I-Q) decomposition, multilevel coded modulation (MLC), turbo code.

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Combining Adaptive Coding and Modulation With Hierarchical Modulation in Satcom Systems

Cited by 35 publications

References 17 publications

Optimising DVB-S2 spectral efficiency with hierarchical modulation for broadband applications

Optimising DVB-S2 spectral efficiency with hierarchical modulation for broadband applications

On Gray Labeling for Downlink Non-Orthogonal Multiple Access Without SIC

Multilevel Coded Modulation With Reduced Latency Decoding Based on Novel Set Partitioning for APSK

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